Drilling machine for the simultaneous drilling of three holes



Oct 11, 1949.

R. A. IELSEN v DRILLING MACHIN OR THE SIMULTANEOUS DRILLING OF THREE LES led Original Fi Feb. 1946 Patented Oct. 11, 1949 UNITED STATES ear-em; OFFICE-- DRILLING MACHINE FOR THE SIMULTA- NEOUS DRILLING OF THREE HOLES Robert Alexander Nielsen, Copenhagen, Denmark Substituted for abandoned application Serial No.

February 26,

This application Section 1, Public Law 690, August 8, 1946 A Patent expires November 10, 1964 1 Claim.

The present invention. relates to an improved drilling machine for simultaneously drilling three holes.

Hitherto known machines of this kind are subject to the drawback that it is not possible to drill the three holes very close to each other, because the spindle bearings prevent the adjustment laterally of the spindles. to the radial extent of the said bearings. It has been proposed to arrange the bearings of the center spindle in a staggered position in relation to the other spindle bearings by which is attained that the spacing of the spindles is reduced to the radial extent of a single bearing.

The object of the present invention is to further 'unprove the relative adjustment of spacing between the three drill spindles in a drilling machine for simultaneously drilling three holes, to the effect that the spindles may be relatively adjusted in such a manner that they almost touch each other, thus rendering possible the drilling of three holes so close to each other as practically possible. This object is attained by means of a specially constructed arrangement of ball bearings as particularly described in the following description with reference to the accompanying drawing.

Fig. 1 is a top elevation of a drilling machine according to the invention,

Fig. 2 is a sectional view on line II-II in Fig. Y

1, and

Fig. 3 is a sectional view on line IlI-III in Fi 1.

The drilling machine comprises a base I provided with two interspaced upright and parallel walls la and lb. This base I may be mounted in any suitable frame not shown in the drawing.

A driving motor 2 is employed for operating the drill mechanism by any conventional means, preferably a chain drive enclosed in a gear box 3 but not detailed in the drawing.

The two upright walls la and lb have each a bore arranged in alignment and through which a spindle 4, is carried, the spindle having a slightly smaller diameter than the said bores. Four ball bearings 5 are arranged in such a manner in each upright wall la and lb that they encircle the spindle 4 and with their outer circumference abut the spindle surface. Each ball bearing is attached by its inner race to the wall and its outer race abutting the spindle surface. Preferably these ball bearings 5 are arranged in each wall in the same plane.

Two slides 6 and l are arranged upon the base I between the upright walls In, and lb in such a manner that they may be displaced to and from each other. Any known means for displacing the slides in relation to each other may be employed, for instance as shown in the drawing a lead screw 8 coasting with threaded lugs attached to each slide, which lugs are not visible on the drawing. The two slides are identical, and one only Will be described in the following. The slide 6 has an upright wall 6a, that is disposed adjacent the upright wall la, and another upright wall 61) that is adjacent the upright wall lb. Each up right wall Ia and lb has a horizontal incision Ill, Fig. 3, and each slide wall to. and 6b a bore, through which apertures a spindle H is carried parallel to the spindle 3. To each slide wall 60. and 9b three ball bearings 12, Fig. 2, are attached in the same manner as described above, encircling the spindle II.

In this manner is attained that while the position of the center spindle remains unaltered, the two laterally disposed spindles H carried by the slides 6 and l respectively may by means of the lead screw 8 be moved nearer to or farther from the center spindle 4, and owing to the particular arrangement of the bearings 5 supporting the center spindle 4, and the bearings l2 supporting the lateral spindles i I, it is possible. to move the latter spindles along the incisions in the upright walls la and lb so close to the center spindle 4 as to almost touching it.

It will be understood that instead of ball bearings, roller bearings may be utilized to the same effect.

The present application is a substitute for applicants abandoned application, Serial No. 649,626 filed February 23, 1946.

I claim:

In a drilling machine for the simultaneous drilling of three holes, the combination with a frame of a carrier member, two interspaced up right walls attached to the carrier member, a central drill spindle carried through holes in the said walls, two slides displaceable in opposite directions between the said walls, vertical plates drill spindle carried therethrough, means for 10 attaching the inner race of each ball bearing to the supporting member in question so that the outer ball bearing race bears upon the surface of the spindle in question, means for displacing the slides in relation to each other, a driving motor, and means for transmitting motive force from the motor to the spindles.

ROBERT ALEXANDER NIELSEN.

No references cited. 

